<?php

declare(strict_types=1);

namespace Monitor\Api\Tests\Realtime;

use Monitor\Api\Db\Database;
use Monitor\Api\Metrics\HookCounter;
use Monitor\Api\Realtime\ChangeFeed;
use Monitor\Api\Repository\AgentRepository;
use Monitor\Api\Repository\EventRepository;
use Monitor\Api\Repository\KpiRepository;
use Monitor\Api\Repository\SystemRepository;
use Monitor\Api\Repository\TicketRepository;
use PHPUnit\Framework\TestCase;

final class ChangeFeedTest extends TestCase
{
    private ChangeFeed $changeFeed;
    private TicketRepository $tickets;
    private EventRepository $events;
    private HookCounter $hooks;
    private string $hooksPath;

    protected function setUp(): void
    {
        $db = Database::inMemory();
        $this->tickets = new TicketRepository($db);
        $this->events = new EventRepository($db);
        $systems = new SystemRepository($db);
        $kpis = new KpiRepository($db);
        $agents = new AgentRepository($db);
        $this->hooksPath = sys_get_temp_dir() . '/monitor-changefeed-hooks-' . uniqid() . '/hooks-count';
        $this->hooks = new HookCounter($this->hooksPath);

        $this->changeFeed = new ChangeFeed($this->tickets, $this->events, $systems, $kpis, $agents, $this->hooks);
    }

    protected function tearDown(): void
    {
        if (file_exists($this->hooksPath)) {
            unlink($this->hooksPath);
        }
        if (is_dir(dirname($this->hooksPath))) {
            rmdir(dirname($this->hooksPath));
        }
    }

    public function testCurrentFingerprintCoversAllSixResources(): void
    {
        $fingerprint = $this->changeFeed->currentFingerprint();

        self::assertSame(['tickets', 'events', 'systems', 'kpis', 'agents', 'hooks'], array_keys($fingerprint));
    }

    public function testDiffIsEmptyWithoutChanges(): void
    {
        $fingerprint = $this->changeFeed->currentFingerprint();

        self::assertSame([], $this->changeFeed->diff($fingerprint, $fingerprint));
    }

    public function testDiffReportsOnlyTheChangedResource(): void
    {
        $before = $this->changeFeed->currentFingerprint();
        $this->tickets->create(['title' => 'Neu']);
        $after = $this->changeFeed->currentFingerprint();

        self::assertSame(['tickets'], $this->changeFeed->diff($before, $after));
    }

    public function testDiffReportsMultipleChangedResources(): void
    {
        $before = $this->changeFeed->currentFingerprint();
        $this->tickets->create(['title' => 'Neu']);
        $this->events->create(['name' => 'Ping', 'message' => 'down', 'severity' => 'error']);
        $after = $this->changeFeed->currentFingerprint();

        $changed = $this->changeFeed->diff($before, $after);
        sort($changed);
        self::assertSame(['events', 'tickets'], $changed);
    }

    /** Ein empfangener Webhook (Issue #38) muss denselben SSE-Push ausloesen wie andere Ressourcen. */
    public function testDiffReportsAReceivedWebhook(): void
    {
        $before = $this->changeFeed->currentFingerprint();
        $this->hooks->increment();
        $after = $this->changeFeed->currentFingerprint();

        self::assertSame(['hooks'], $this->changeFeed->diff($before, $after));
    }
}